I'm occasionally renting my comfy 40m² apartment in the 16th district of Vienna which is perfect for 2+1 people. It has excellent transport connections and you get everything you need in the immediate vicinity. You like that? Well, go for it!
Most important is that we have a good connection and that I can trust you because for me it's a big thing to rent my apartment to people I don't know. Of course there are certain rules but I don't think that they are different to any other house rules.
I really appreciate cleanness and a appropriate behaviour. That just means that I don't want you to disturb my neighbors (wild parties, loud music, etc.), destroy my furniture or devices and treat, and so on...
Besides that I would need somebody who could take care of my plant (it's only one and to be honest I don't think it has an easy life with me because I'm constantly forgetting about it...)